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RenderFrameMetadataProvider(RFMP) is not available until calling
RWHI::RequestCompositorFrameSink, that is no observer can be added before
that point, which may not be convenient for all observers. In this patch,
RenderFrameMetadataProvider will be created in RenderWidgetHostImpl
constructor and the ready to receive and send information after calling
RequestCompositorFrameSink.

For Example: RenderWidgetHostViewAura is created and start to observe changes
in RFM before calling RWHI::RequestCompositorFrameSink.

Bug: 716911

Change-Id: Icac9d5ff44a24b2a828bb7946202917f79c93147
Reviewed-on: https://chromium-review.googlesource.com/952200
Commit-Queue: Yi Xu <yiyix@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541645}